Question

why are ions important to living things?
o electrical signals are often based on ions.
o sodium ions encode the instructions for making nucleic acids.
o proteins in muscles are combinations of ions.
o ions provide the oxygen needed for respiration.

Explanation:

Ions play a crucial role in generating electrical signals in living organisms. For example, in neurons, the movement of sodium and potassium ions across the cell - membrane is essential for the generation and propagation of action potentials. Nucleic acids are encoded by nucleotides, not sodium ions. Proteins are made of amino - acids, not combinations of ions. Oxygen for respiration is obtained from the environment and is not provided by ions.

Answer:

Electrical signals are often based on ions.